You are not at a dealer to bargain.
You should proceed as follows; You need to be thinking out the door price not what the dealer tells you. He will have a million add-ons after you negotiate and in your mind you have already said "yes"
Put your name, address and phone number on a card. Go back to the dealer state the following.
"I want to buy this rig. My offer is $30,000 out the door no add-ons. My price includes tax, state fees and registration and any dealer prep or other add-ons you dream up. I am not here to dicker I am here to buy and am willing to give you a deposit and pay the balance after MY PREDELIVERY IINSPECTION finds all is good. I will not take delivery until all systems are working nor will I pay you until all systems work.
If they say yes and you need to finance (which you should do before shopping) then you say the following
"I have financed my purchase through _____________ at an APR of ______% for _____ months. If you can beat that I will allow you the to place the financing for me.
BE CAREFUL as I have seen salesmen change the terms after the first signing with various ruses. MAKE SURE YOU THOROUGHLY read every document BEFORE SIGNING. Do not believe the salesman. He IS NOT your friend. You are how he feeds his family and they want Filet Mignon make sure they are not tricking you up from ground beef.
Do a thorough pre-delivery before signing for the rig and make sure they plug in the fridge 24 hours before the inspection and fill the water tank/hot water heater. I am serious if you show up and it is not done reschedule and TELL THEM WHY.
You are not there to be nice. As the saying goes "Its just business"